Long-Term Incentive Plan (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Long-Term Incentive Plan
Number of shares authorized	1,908,332
Number of shares issuable	10,925
Total compensation cost	$ 291,000	$ 951,000
Stock options
Long-Term Incentive Plan
Term of stock options granted	10 years
Period of which historical volatilities of the Company's common stock are used for calculation of expected volatilities	5 years
Expected weighted-average period for recognition of unrecognized compensation		29 days
Shares
Balance outstanding at the beginning of the period (in shares)	500,000
Canceled (in shares)	(28,500)
Expired (in shares)	(62,000)
Balance outstanding at the end of the period (in shares)	409,500	500,000
Exercisable at end of period (in shares)	409,500
Weighted Average Exercise Price
Balance outstanding at the beginning of the period (in dollars per share)	$ 27.34
Canceled (in dollars per share)	$ 25.54
Expired (in dollars per share)	$ 18.81
Balance outstanding at the end of the period (in dollars per share)	$ 28.75	$ 27.34
Exercisable at end of period (in dollars per share)	$ 28.75
Weighted Average Remaining Contractual Term (years)
Balance outstanding at the end of the period	3 years
Exercisable at end of period	3 years
Nonvested options
Nonvested at the beginning of the period (in shares)	4,000
Forfeited (in shares)	(500)
Vested (in shares)	(3,500)
Nonvested at the end of the period (in shares)		4,000
Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)	$ 2.01
Forfeited (in dollars per share)	$ 2.01
Vested (in dollars per share)	$ 2.01
Nonvested at the end of the period (in dollars per share)		$ 2.01
Stock options | Maximum
Long-Term Incentive Plan
Total unrecognized compensation cost		1,000
Restricted stock and restricted stock units
Long-Term Incentive Plan
Vesting period	3 years
Expected weighted-average period for recognition of unrecognized compensation	10 months 24 days
Nonvested shares of restricted shares rights
Nonvested at the beginning of the period (in shares)	426,192
Granted (in shares)	60,000	156,320
Vested (in shares)	(144,976)	(98,770)
Forfeited (in shares)	(13,296)
Nonvested at the end of the period (in shares)	327,920	426,192
Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)	$ 4.15
Granted (in dollars per share)	$ 1.25
Vested (in dollars per share)	$ 7.14
Forfeited (in dollars per share)	$ 3.28
Nonvested at the end of the period (in dollars per share)	$ 2.21	$ 4.15
Total unrecognized compensation cost of restricted awards	$ 96,000